[vbox-dev] ISession lock/unlock problems

Klaus Espenlaub klaus.espenlaub at oracle.com
Tue Mar 27 07:23:10 PDT 2012

On 25.03.2012 18:42, Andrea Turli wrote:
> Hi,
> I'm trying to implement a java client able to interact with Vbox API.
> Reading the documentation I've found this document
> https://www.virtualbox.org/sdkref/interface_i_machine.html#5f6e112de89f7e1d300738c9a055d5c9
> where it is said explicity:
> "The caller must eventually release the session's shared lock by
> calling ISession::unlockMachine on the local session object once this
> call has returned. However, the session's state (see ISession::state)
> will not return to "Unlocked" until the remote session has also
> unlocked the machine (i.e. the machine has stopped running)."
> In fact IMachine.getSessionState() and ISession.getState() are not
> always in sync. Is there a way to ensure that the ISession ::state is
> effectively Unlocked before another methods tries to use it?
> Can I loop on the ISession::state until the ISession is Unlocked for
> all, and how?

What's the problem you're trying to solve? It's a bit difficult to 
answer a question you didn't ask.

Are you launching a VM, or are you trying to make changes to the 
settings of a running VM? Quite different cases when it comes to sessions.


> Thank you,
> Andrea
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